[Cuis] [BUG] Can't click into empty class pane.

[Casey Ransberger]

Repro:

Open a system browser.
Right click the category pane.
Click add item...
Type a new category name.
Accept.
Click in the class pane.

Actual:

Subscript was out of bounds. Here's what was on the stack:

 #('Array(Object)>>error:' 'Array(Object)>>errorSubscriptBounds:'
'Array(Object)>>at:' 'Browser>>classListIndex:'
'PluggableListMorph>>changeModelSelection:'
'PluggableListMorph>>mouseUp:localPosition:'
'PluggableListMorph(Morph)>>processMouseUp:localPosition:'
'MouseButtonEvent>>sentTo:localPosition:'
'PluggableListMorph(Morph)>>handleFocusEvent:'
'HandMorph>>startMouseDispatch:'
'MouseButtonEvent(MouseEvent)>>startDispatchFrom:'
'HandMorph>>startEventDispatch:' 'HandMorph>>processEventQueue' '[] in
WorldState>>doOneCycleNowFor:' 'Array(SequenceableCollection)>>do:'
'WorldState>>handsDo:' 'WorldState>>doOneCycleNowFor:'
'WorldState>>doOneCycleFor:' 'PasteUpMorph>>doOneCycle' '[] in ProjectX
class>>spawnNewMorphicProcessFor:')


-- 
Casey Ransberger
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